Crossword Genius

Unimportant fish in loch? On the contrary (4)

Ross

I believe the answer is:

idle

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This clue could be a double definition.

'unimportant' is the first definition.
(thesaurus)

'fish in loch? on the contrary' is the second definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

Can you help me to learn more?

(Other definitions for idle that I've seen before include "Frivolous" , "Avoiding work, lazy" , "without basis" , "At leisure" , "Still" .)

I've seen this clue in The Independent.
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